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. 2022 Feb 7;15:13. doi: 10.1186/s13068-022-02111-3

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 4 — Shikimic acid production. a Light controlled shikimic acid production pathway. Light controlled shikimic acid production pathway. GlC, glucose; Zmglf, glucose facilitator from Z. mobilis; PTS, phosphotransferase system; G6P, glucose 6-phosphate; Ru5P, ribulose-5-phosphate; PEP, phosphoenolpyruvate; PYR, pyruvate; aroB^opt, codons optimized DHQ synthase; ydiB, quinate/shikimate dehydrogenase; aroG^fbr, feedback-resistant mutants of DAHP synthase; E4P, erythrose-4-phosphate; aroK, shikimate kinase I; DAHP, 3-deoxy-D-arabino-heptulosonate-7-phosphate; QA, Quinic acid; DHQ, 3-dehydroquinic acid; DHS, 3-dehydroshikimic acid; SA, shikimate; S3P, shikimate-3-phosphate; AAA, aromatic amino acids. Gene knockouts were presented in grey color. b Screening the suitable chassis strain for shikimic acid production in a rich medium. c Design of TPAS and TPRS for shikimic acid production. d Evaluation of bifunctional optogenetic switch (S8) and individual components, TPRS (S6) and TPAS (S7) systems, for shikimic acid production. e Fed-batch fermentation using NBS minimal medium in a 5 L bioreactor. f Fed-batch fermentation using an enriched medium in a 5 L bioreactor. Values are shown as the mean ± s.d. (n = 3)